Can this be bad new for us?

I took 3 tests a few days ago including a digital test and they all gave me positive, I have been testing everyday since and it feels like the posivites are getting a bit lighter instead of darker, I’m using the same brand every time. Hubby says he doesn’t see them lighter. Am I worrying too much? Can it be because I’m drinking a lot of water since I found out I’m pregnant? Also, I have had no bleeding or implantation, but already have the black line dividing my body... please advice if this happened to you and everything was ok 🙏🏻. And thank you in advance